CVE-2026-43205
Description
A flaw was found in the Linux kernel dpaa2-switch driver. This out-of-bounds write vulnerability occurs because the driver does not validate the num_ifs value reported by the firmware against the DPSW_MAX_IF limit. A highly privileged attacker, capable of influencing the DPAA2 firmware or management complex attributes, could exploit this to trigger kernel memory corruption through flood configuration handling.
Statement
A flaw in the Linux kernel dpaa2-switch driver allows an out-of-bounds write when a firmware-reported num_ifs value is not validated against DPSW_MAX_IF. A highly privileged attacker able to influence the DPAA2 firmware or management complex attributes could trigger kernel memory corruption through flood configuration handling. For the CVSS the PR:H is used because the vulnerable value originates from firmware/device attributes rather than from an unprivileged local or remote user-controlled input.
Mitigation
To mitigate this issue, prevent module fsl-dpaa2-eth from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.7 | 7.8 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | High | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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